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GEOLOGY ON POST STAMPS |
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GEOLOGY ON POST STAMPS |
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Armenia / Armenia
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Piryt 
Pyrite |
Agat
Agate |
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Kwarc
Quartz |
Molibdenit
Molybdenite |
Piryt, agat, kwarc (kryształ górski) i molibdenit; znaczki wydane w roku 1998.
Pyrite, agate, quartz
(rock crystal) and molybdenite; stamps issued in 1998.
Images courtesy A. Zydorczak
